高度非易燃离子液/二氧化甲复合电解质,用于高性能离子电池
Purna Chandra Rath1, Chun-Yen Chen1, Jagabandhu Patra1,2
1Department of Materials Science and Engineering, National Yang Ming Chiao Tung University, 1001 University Road, Hsinchu, 30010, Taiwan.
Advanced science (Weinheim, Baden-Wurttemberg, Germany)
|March 17, 2025
概括
一种新的高离子液/复合电解质提高了离子电池的安全性和性能. 这种先进的电解质可使石墨和高正极稳定4.5V运行.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 储能 储能 储能 储能 储能 储能
背景情况:
- 高能量密度和安全的离子电池对于下一代能源存储至关重要.
- 当前的电解质面临着安全性,稳定性和高电压性能方面的挑战.
- 要克服这些局限性,需要在电解质组成方面取得进展.
研究的目的:
- 开发和描述一种新型的高离子液体/以太复合电解质.
- 研究独特的协调结构及其对离子运输和相间形成的影响.
- 为了评估电解质在使用先进电极材料的高压离子电池中的性能.
主要方法:
- 合成一个复合电解质,包括N-propyl-N-methylpyrrolidinium bis(trifluoromethanesulfonyl) imide (PMP-TFSI) 离子液体,二氧化甲 (DME),二氧化 (LiDFOB),乙烯碳酸盐 (FEC) 和1,1,2,2-四甲-2,2,3,3-四甲乙烯 (TTE).
- 分析电解质的协调结构及其对Li+溶解动力学及其对固体电解质间相 (SEI) 化学的影响.
- 使用石墨和SiOx阳极以及4.5V的LiNi0.8Co0.1Mn0.1O2阴极对全电池进行电化学测试.
- 操作X射线衍射 (XRD) 来研究离子间隔行为.
主要成果:
- 拟议的电解质具有较低的易燃性,高的热稳定性,对电流收集器的腐蚀性可以忽略不计.
- 它在高达5V的电位下稳定运行,并且与石墨,SiOx阳极和LiNi0.8Co0.1Mn0.1O2阴极具有很好的兼容性.
- 操作XRD证实了DME和PMP+对石墨的共同插曲的抑制,这是一个常见的问题.
- 一个4.5V LiNi0.8Co0.1Mn0.1O2//石墨全电池显示出优越的特异性,速率能力和循环稳定性.
结论:
- 高性离子液/以太复合电解质为高压,高安全性离子电池提供了一个有前途的解决方案.
- 电解质内的独特协调环境有助于提高界面稳定性和离子传输.
- 这种电解质在先进的储能系统中显示出实际应用的巨大潜力.
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